Topic: 22r/20r hybrid or efi swap

[twistedtoy92]

91 minimum

[79coyotefrg]

I had to run 90 octane which is mid grade here.   we have 87, 89 or 90 and premium is 92 or 93 depending on the station.  87 octane would cause pre detonation.

[twistedtoy92]

Yeah we have 87,89,91 non ethanol, and 92... I find the 91 non ethanol was the best for my options. As Glen said though, 90 would be as low as I'd run, detonation kills engines...

What is your compression Glen?

[4xChinook4 [OP]]

Cool thanks , glad to know, and with my  new cam, I should install new rocker arms aswell, right? Napa?

[4xChinook4 [OP]]

And would some one who has gone the super charger route, please school me on em? Worth it? Not? I know LCE has one for 22r, I'd fab an adapter plate for this, but 3000 bone for the thing!! Any other options?

[4xChinook4 [OP]]

And by the way found some pictures  of the inside, not 100% current  but pretty dang close, in the picture > sink and furnace on left, and 2 burner stove top on left, a cabinet and open area for a frig / storage is now under the stove, aswell as small closet behind that now. But this is the old design, so I'll be posting a thread when I break into again for the revamped design, but everything going was built from  scratch by me, this was also my first time for any of this, so it's got its flaws, just gets me ore excited to do it right this next time around . 👍

[4xChinook4 [OP]]

Here she was taking me and gramps to enjoy some time in the Colorado rockies . Before the swap onto the 80 chassis of coarse

[4xChinook4 [OP]]

Bed form, only ~ 5' 9" from head to toe though, so only my height and lower for a comfortable  night. , :thumbsdown: for all my buddies taller than me. this is and was a big motivation for the new design plan, roughly a 7' bed . 

Definitely had some fun time with this design though

[79coyotefrg]

Yeah we have 87,89,91 non ethanol, and 92... I find the 91 non ethanol was the best for my options. As Glen said though, 90 would be as low as I'd run, detonation kills engines...

What is your compression Glen?

the hybrid ran around 190 psi   it would wind out as fast as a dirt bike too

[4xChinook4 [OP]]

School me on the compression ratio? 190 psi?

[twistedtoy92]

Thats how much compression is created inside the combustion chamber.

[twistedtoy92]

Process of the 4 stroke engine: Suck>intake, Squeeze>compression, Bang>power, Blow>exhaust.

[4xChinook4 [OP]]

Haha ya I know how the engine works twisted thanks for answering though, I mean how do you figure out the compression numbers 

[4xChinook4 [OP]]

Haha wow I feel totally blonde  ignore that last comment
 Haha hahaha

[4xChinook4 [OP]]

Let's talk super charging ? Options, will it detract from reliability ?

[79coyotefrg]

  calculating compression ratio requires knowing precisely the volume of the combustion chamber in the head, minus how much piston sticks above the deck and the volume of the headgasket.  in relation to how much volume is there when top dead center and bottom dead center
finding the compression on the other hand is just running a compression test.

[79coyotefrg]

here are two different types,  I have both but when doing it by yourself the screw in type works best.

[79coyotefrg]

and of course then comes into play the lobe separation of the cam and lift and duration.  most engines the exhaust valve closes before the intake opens but on race engines  the intake starts opening before the exhaust closes creating a siphoning effect at high rpm's and at low rpms the same engine sputters and sounds like its missing because the valves overlap. this is what makes them "lope".

[79coyotefrg]

Let's talk super charging ? Options, will it detract from reliability ?

no, you need deep gears. I'm talking 5.29's and 33's and plan on a V6 radiator.

[79coyotefrg]

btw, what did you do with the 77 chassis??

[4xChinook4 [OP]]

I sold it to a yota yard, to help knock the price off of a L52 tranny, a 91' rear axel with 4.88s in it, and a 4.88 diff for the front. Bought the trio in one shot.

[4xChinook4 [OP]]

If you were thinking of swapping the rears from  the 77 to my 80, I already thought of it, and I checked the gearing, 77 had 4.11, and my 80 had 4.33.

[4xChinook4 [OP]]

And I couldn't rotate the tires, the 77' had 5 lug, instead of 6

[4xChinook4 [OP]]

no, you need deep gears. I'm talking 5.29's and 33's and plan on a V6 radiator.

Wouldn't going deeper in my gearing, send me farther away from highway ?

[79coyotefrg]

it will send your rpm higher but that thing is going to be like pulling a parachute so you want a cruising speed of 65 to be in the middle of that torque curve.

[79coyotefrg]

what tires are you going to run again??

[79coyotefrg]

4.10 gears in the 77 but it probably had 7.00x14 tires

[4xChinook4 [OP]]

32's

[4xChinook4 [OP]]

I know they wouldn't exactly help my highway cause. But a buddy of mine has a full set of mud terrains, that he will sell me for cheap

[4xChinook4 [OP]]

Oh and I forgot to mention, not sure if this is relavent  now, but the original chinook's motor wasn't it's own, it was swapped from a Dolphin of the same year, is it possible it had a different cam? rv cam maybe?, should I try and get that cam back from the yard I sold the chassis to, or should I stay with putting  the street cam from LCE? And put it on my current 20r? (1980)